Date: Fri, 22 May 2020 23:12:51 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Paul Floyd <pjfloyd@wanadoo.fr> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: SIGBUS si_code 12 Message-ID: <20200522201251.GM64045@kib.kiev.ua> In-Reply-To: <D22F2087-4FB3-4EB5-841E-61C809DF94F0@wanadoo.fr> References: <2102917207.11671.1589487524169.JavaMail.www@wwinf1n11> <490544208.11847.1589489181927.JavaMail.www@wwinf1n11> <20200514224347.GB46537@kib.kiev.ua> <9840EA0E-CF11-4332-A5A0-A3CDBA0F0464@wanadoo.fr> <20200521154621.GB85681@raichu> <068F2B99-24C2-4F38-ACC1-02273C198434@wanadoo.fr> <679A6BE4-E344-49D0-B76D-DB65A41E26FA@wanadoo.fr> <20200522192804.GL64045@kib.kiev.ua> <D22F2087-4FB3-4EB5-841E-61C809DF94F0@wanadoo.fr>
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On Fri, May 22, 2020 at 09:54:40PM +0200, Paul Floyd wrote: > > > > On 22 May 2020, at 21:28, Konstantin Belousov <kostikbel@gmail.com> wrote: > > > > On Fri, May 22, 2020 at 05:32:37PM +0200, Paul Floyd wrote: > >> A bit more on this. > >> > >> The code in question is in trap.c: > > [snip] > > >> > >> I have machte.prot_fault_translation set to 0 (the default I believe) so this enters the first ‘else if’ branch. > >> > >> The value of p_osrel looks like it comes from retold.c. I see two mechanisms - passed via auxv AT_OSRELDATE (with a backup of using a sysctl) and reading the NT_FREEBSD_ABI_TAG note - I’m not sure which is used in this case. > > I do not know what retold.c is. > > > That’s how autocorrect thinks that rtld.c should be spelt. > > > >> > >> The auxv value seems to be sent and I can’t see why either should be failing. > > > > auxv has nothing to do with p_osrel as seen by kernel. In-kernel > > ELF image activator parses notes and reads osrel if available. > > And which files/functions do that? ELF image activator. Look in kern/imgact_elf.c. It is basically in check_note, used from get_brandinfo. The real function names are mangled for co-existence of 32 and 64 bit elf activators.
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